# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=100

[Latest](https://discourse.vtk.org/latest.md) · [Categories](https://discourse.vtk.org/categories.md) · [Tags](https://discourse.vtk.org/tags.md)

**Page:** 101

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## [Detecting visible mesh faces in a scene rendered outside of VTK](https://discourse.vtk.org/t/detecting-visible-mesh-faces-in-a-scene-rendered-outside-of-vtk/6214)

<div class="topic-metadata">

**Author:** [@tsnoble](https://discourse.vtk.org/u/tsnoble)\
**Replies:** 26\
**Last updated:** [July 22, 2021, 4:23pm UTC](https://discourse.vtk.org/t/detecting-visible-mesh-faces-in-a-scene-rendered-outside-of-vtk/6214 "2021-07-22T16:23:08Z")

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Hi, I’m currently attempting to select all faces of a mesh visible to a camera in a scene rendered through Qt & Ogre. Ogre doesn’t seem to provide much in the way of this, and I’m already loading the mesh into a vtkPoly…

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## [VTK Synchronized MPR behavior issue.](https://discourse.vtk.org/t/vtk-synchronized-mpr-behavior-issue/6225)

<div class="topic-metadata">

**Author:** [@BadCookie](https://discourse.vtk.org/u/BadCookie)\
**Replies:** 0\
**Last updated:** [July 22, 2021, 2:04pm UTC](https://discourse.vtk.org/t/vtk-synchronized-mpr-behavior-issue/6225 "2021-07-22T14:04:46Z")

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Hi all, I wanted to link the 3 views axial, coronal and sagittal views so that when mouse interaction takes place on one view, it simultaneously updates the other views. Things I’ve tried… I have tried the following e…

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## [Xcode cannot open renderer](https://discourse.vtk.org/t/xcode-cannot-open-renderer/6219)

<div class="topic-metadata">

**Author:** [@fmilicchio](https://discourse.vtk.org/u/fmilicchio)\
**Replies:** 0\
**Last updated:** [July 21, 2021, 4:24pm UTC](https://discourse.vtk.org/t/xcode-cannot-open-renderer/6219 "2021-07-21T16:24:32Z")

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Hello all, I am using for the first time VTK (9.0.1 from anaconda) on a macOS machine (11.4), and I seem to be unable to open the renderer window, or better, something happens, I see the icon, but it closes immediately. …

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## [Functions in different versions](https://discourse.vtk.org/t/functions-in-different-versions/6205)

<div class="topic-metadata">

**Author:** [@yuantangjin](https://discourse.vtk.org/u/yuantangjin)\
**Replies:** 9\
**Last updated:** [July 21, 2021, 3:41am UTC](https://discourse.vtk.org/t/functions-in-different-versions/6205 "2021-07-21T03:41:13Z")

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I found an open source code on GitHub. This code was developed earlier, so he called the method in the “vtkXMLPUnstructuredGridWriter.h” file in the VTK5.0.3 version, but I encountered many problems installing the old ve…

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## [Problem building VTK](https://discourse.vtk.org/t/problem-building-vtk/6197)

<div class="topic-metadata">

**Author:** [@GeorgeS](https://discourse.vtk.org/u/GeorgeS)\
**Replies:** 6\
**Last updated:** [July 16, 2021, 7:14pm UTC](https://discourse.vtk.org/t/problem-building-vtk/6197 "2021-07-16T19:14:36Z")

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I’ve been happily developing large projects for VTK and ITK for years, but I am not a CMake expert. I just switched to a new Mac Powerbook with the M1 chip, and I’m getting errors running CMake on VTK I’ve updated to t…

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## [Plot3D File Reader Problems](https://discourse.vtk.org/t/plot3d-file-reader-problems/6201)

<div class="topic-metadata">

**Author:** [@luismsfern](https://discourse.vtk.org/u/luismsfern)\
**Replies:** 0\
**Last updated:** [July 16, 2021, 5:52pm UTC](https://discourse.vtk.org/t/plot3d-file-reader-problems/6201 "2021-07-16T17:52:11Z")

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I’m trying to read a Plot3D file into ParaView using vtk directly, but I am running into problems. I have the grid file (.x) and the code I have access to writes out the function file containing the solution data (.f). T…

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## [In ParaView, what plane widget is used when clipping?](https://discourse.vtk.org/t/in-paraview-what-plane-widget-is-used-when-clipping/6199)

<div class="topic-metadata">

**Author:** [@tobias](https://discourse.vtk.org/u/tobias)\
**Replies:** 0\
**Last updated:** [July 16, 2021, 12:35pm UTC](https://discourse.vtk.org/t/in-paraview-what-plane-widget-is-used-when-clipping/6199 "2021-07-16T12:35:43Z")

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What plane widget is used in ParaView to represent where the clipping plane goes?

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## [How to achieve a single actor mouse drag, rotation and other interactive issues?](https://discourse.vtk.org/t/how-to-achieve-a-single-actor-mouse-drag-rotation-and-other-interactive-issues/6187)

<div class="topic-metadata">

**Author:** [@wulicheng](https://discourse.vtk.org/u/wulicheng)\
**Replies:** 2\
**Last updated:** [July 16, 2021, 2:08am UTC](https://discourse.vtk.org/t/how-to-achieve-a-single-actor-mouse-drag-rotation-and-other-interactive-issues/6187 "2021-07-16T02:08:56Z")

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How to achieve a single actor mouse drag, rotation and other interactive issues like this:

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## [Byte array in vtk pipeline](https://discourse.vtk.org/t/byte-array-in-vtk-pipeline/6195)

<div class="topic-metadata">

**Author:** [@kit](https://discourse.vtk.org/u/kit)\
**Replies:** 7\
**Last updated:** [July 15, 2021, 5:56pm UTC](https://discourse.vtk.org/t/byte-array-in-vtk-pipeline/6195 "2021-07-15T17:56:14Z")

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Hi All, I am looking to create a vtk pipeline that passes a byte array as data. The data array does not contain any topological structure and can be any length (it’s a custom encoding of a data array). As such I am not …

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## [VTK debug\_leaks with Visual studio 2013](https://discourse.vtk.org/t/vtk-debug-leaks-with-visual-studio-2013/5829)

<div class="topic-metadata">

**Author:** [@sateesh](https://discourse.vtk.org/u/sateesh)\
**Replies:** 7\
**Last updated:** [July 15, 2021, 8:18am UTC](https://discourse.vtk.org/t/vtk-debug-leaks-with-visual-studio-2013/5829 "2021-07-15T08:18:41Z")

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Hi, I have observed some strange behavior with “VTK debug leaks” in VS 2013. In a sample project made with VTK 8.1, I’m able to get the debug leaks in console when I close the application. But in Main project, unable t…

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## [How to assembly two actors?](https://discourse.vtk.org/t/how-to-assembly-two-actors/6193)

<div class="topic-metadata">

**Author:** [@wulicheng](https://discourse.vtk.org/u/wulicheng)\
**Replies:** 0\
**Last updated:** [July 15, 2021, 7:04am UTC](https://discourse.vtk.org/t/how-to-assembly-two-actors/6193 "2021-07-15T07:04:44Z")

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Whe I assembly two actors using vtkAssembly, the position of the second actor differ from I added these two actors one by one,like this:

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## [Clipping a volume with a plane and vtkImplicitPlaneWidget2](https://discourse.vtk.org/t/clipping-a-volume-with-a-plane-and-vtkimplicitplanewidget2/6168)

<div class="topic-metadata">

**Author:** [@Edoardo\_Pasca](https://discourse.vtk.org/u/Edoardo_Pasca)\
**Replies:** 1\
**Last updated:** [July 14, 2021, 7:49pm UTC](https://discourse.vtk.org/t/clipping-a-volume-with-a-plane-and-vtkimplicitplanewidget2/6168 "2021-07-14T19:49:09Z")

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Hi all, I’m successfully clipping a volume render using the mapper’s (vtkSmartVolumeMapper) AddClippingPlane, passing a fully configured vtkPlane: plane = vtk.vtkPlane() plane.SetOrigin(0,125,0) plane.SetNormal(0.,1.,0…

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## [how to write .xml .vtk or vtp with color?](https://discourse.vtk.org/t/how-to-write-xml-vtk-or-vtp-with-color/2731)

<div class="topic-metadata">

**Author:** [@ShaneKirkbride](https://discourse.vtk.org/u/ShaneKirkbride)\
**Replies:** 11\
**Last updated:** [July 14, 2021, 4:59pm UTC](https://discourse.vtk.org/t/how-to-write-xml-vtk-or-vtp-with-color/2731 "2021-07-14T16:59:54Z")

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I’m trying to save a polyData mesh with color. I set the color like this: // Generate the colors for each point based on the color map vtkSmartPointer\<vtkUnsignedCharArray\> colors = vtkSmartPointer\<vtkUnsignedCharA…

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## [Scalar bar Collision](https://discourse.vtk.org/t/scalar-bar-collision/6188)

<div class="topic-metadata">

**Author:** [@devngc](https://discourse.vtk.org/u/devngc)\
**Replies:** 0\
**Last updated:** [July 14, 2021, 11:43am UTC](https://discourse.vtk.org/t/scalar-bar-collision/6188 "2021-07-14T11:43:33Z")

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Hi All, I am wondering if it is possible to do collision detection between two scalar bar actors. I saw this thread that mentioned CollisionDetectionFilter. I saw that the filter works with Polydata. Is there a way to …

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## [How to set the center of vtkactor autobiography？](https://discourse.vtk.org/t/how-to-set-the-center-of-vtkactor-autobiography/6071)

<div class="topic-metadata">

**Author:** [@wulicheng](https://discourse.vtk.org/u/wulicheng)\
**Replies:** 7\
**Last updated:** [July 14, 2021, 11:27am UTC](https://discourse.vtk.org/t/how-to-set-the-center-of-vtkactor-autobiography/6071 "2021-07-14T11:27:18Z")

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How to set the center of vtkActor autobiography when I moved the translate the actor？

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## [vtkMoleculeMapper: gaps in bonds on zooming in](https://discourse.vtk.org/t/vtkmoleculemapper-gaps-in-bonds-on-zooming-in/6183)

<div class="topic-metadata">

**Author:** [@SunTzunami](https://discourse.vtk.org/u/SunTzunami)\
**Replies:** 0\
**Last updated:** [July 14, 2021, 6:10am UTC](https://discourse.vtk.org/t/vtkmoleculemapper-gaps-in-bonds-on-zooming-in/6183 "2021-07-14T06:10:26Z")

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Hi all! I was using vtkMoleculeMapper to render atoms and bonds. It renders them well but on zooming in, I observe gaps between bonds - What might be causing them and is there any way to fix this? Thanks in advance!

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## [vtkProteinRibbonFilter usage without using vtkPDBReader](https://discourse.vtk.org/t/vtkproteinribbonfilter-usage-without-using-vtkpdbreader/6079)

<div class="topic-metadata">

**Author:** [@SunTzunami](https://discourse.vtk.org/u/SunTzunami)\
**Replies:** 1\
**Last updated:** [July 14, 2021, 5:42am UTC](https://discourse.vtk.org/t/vtkproteinribbonfilter-usage-without-using-vtkpdbreader/6079 "2021-07-14T05:42:26Z")

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Hi all! I’m trying to use vtk (via python) to render Ribbon diagrams for proteins and vtkProteinRibbonFilter has been quite helpful in this. I am able to render Ribbon diagrams for PDB files by using the code below - #…

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## [Problem with the installation of vtk and qt modules](https://discourse.vtk.org/t/problem-with-the-installation-of-vtk-and-qt-modules/4464)

<div class="topic-metadata">

**Author:** [@Ruf](https://discourse.vtk.org/u/Ruf)\
**Replies:** 3\
**Last updated:** [July 14, 2021, 2:40am UTC](https://discourse.vtk.org/t/problem-with-the-installation-of-vtk-and-qt-modules/4464 "2021-07-14T02:40:50Z")

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Hello everybody, I’m trying to install VTK with some Qt modules, when trying to compile ALL\_BUILD in Visual Studio 2019, I get a series of errors that seem to come from the main error related to the vtkRenderingQt module…

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## [Laplacian Filter](https://discourse.vtk.org/t/laplacian-filter/6174)

<div class="topic-metadata">

**Author:** [@Hyunwoo\_Kim](https://discourse.vtk.org/u/Hyunwoo_Kim)\
**Replies:** 3\
**Last updated:** [July 13, 2021, 5:16pm UTC](https://discourse.vtk.org/t/laplacian-filter/6174 "2021-07-13T17:16:23Z")

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Hi, I want to use a smoothing tool for my poly data. my poly data is a surface mesh of grey matter. However, when I use a smoothing filter, the surfaces intersect each other. int smoothingIterations = 40; …

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## [build vtk v9.0.0 + Examples for iOS](https://discourse.vtk.org/t/build-vtk-v9-0-0-examples-for-ios/3412)

<div class="topic-metadata">

**Author:** [@gpotari](https://discourse.vtk.org/u/gpotari)\
**Replies:** 1\
**Last updated:** [July 13, 2021, 9:20am UTC](https://discourse.vtk.org/t/build-vtk-v9-0-0-examples-for-ios/3412 "2021-07-13T09:20:18Z")

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I’m trying to compile VTK 9.0.0 for iOS, as per the instructions inside README file under Examples/iOS folder which means run cmake with -DVTK\_IOS\_BUILD=ON. When I run make -j8, I got the following error: vtk/Rendering…

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## [How to build VTK on a supercomputer without X-Server and no root previliges](https://discourse.vtk.org/t/how-to-build-vtk-on-a-supercomputer-without-x-server-and-no-root-previliges/377)

<div class="topic-metadata">

**Author:** [@singularity](https://discourse.vtk.org/u/singularity)\
**Replies:** 4\
**Last updated:** [July 13, 2021, 12:40am UTC](https://discourse.vtk.org/t/how-to-build-vtk-on-a-supercomputer-without-x-server-and-no-root-previliges/377 "2021-07-13T00:40:28Z")

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Hi. With all the great help from this forum, I have managed to write a usable VTK volume rendering C++ code. I want to use this code on a supercomputer with no X display server or root privileges. The main thing that I w…

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## [vtkrenderedareaselector with one vtkAssembly for the renderer](https://discourse.vtk.org/t/vtkrenderedareaselector-with-one-vtkassembly-for-the-renderer/6163)

<div class="topic-metadata">

**Author:** [@Bill\_McGrory](https://discourse.vtk.org/u/Bill_McGrory)\
**Replies:** 0\
**Last updated:** [July 9, 2021, 6:06pm UTC](https://discourse.vtk.org/t/vtkrenderedareaselector-with-one-vtkassembly-for-the-renderer/6163 "2021-07-09T18:06:50Z")

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I have an application that I am porting an earlier version of VTK (5.2) to use the latest supported version. The legacy app has a single renderer with a single vtkAssembly that builds a nested structure of actors. Pickin…

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## [vtk.js: reading gzipped, binary STLs with vtkSTLReader](https://discourse.vtk.org/t/vtk-js-reading-gzipped-binary-stls-with-vtkstlreader/6134)

<div class="topic-metadata">

**Author:** [@aerogt3](https://discourse.vtk.org/u/aerogt3)\
**Replies:** 2\
**Last updated:** [July 5, 2021, 6:44pm UTC](https://discourse.vtk.org/t/vtk-js-reading-gzipped-binary-stls-with-vtkstlreader/6134 "2021-07-05T18:44:44Z")

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Hi, I’m using vtk.js to read in and display locally stored STL files in the browser, which so far is working great for binary STLs. It works for reading/displaying remotely stored files as well, but the file size can be…

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## [Correct Application of a Smoothing filter on an IsoSurface](https://discourse.vtk.org/t/correct-application-of-a-smoothing-filter-on-an-isosurface/6147)

<div class="topic-metadata">

**Author:** [@vsrivastava](https://discourse.vtk.org/u/vsrivastava)\
**Replies:** 7\
**Last updated:** [July 9, 2021, 3:30pm UTC](https://discourse.vtk.org/t/correct-application-of-a-smoothing-filter-on-an-isosurface/6147 "2021-07-09T15:30:24Z")

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vtkSmartPointer\<vtkMarchingCubes\> iso = vtkSmartPointer\<vtkMarchingCubes\>::New(); iso-\>SetInputConnection(NrrdFileReader-\>GetOutputPort()); iso-\>ComputeGradientsOn(); iso-\>ComputeScalarsOff(); iso-\>SetValue(0, 1); iso-\>U…

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## [Question about vtkHardWareSelector](https://discourse.vtk.org/t/question-about-vtkhardwareselector/6161)

<div class="topic-metadata">

**Author:** [@yuhaoqiu](https://discourse.vtk.org/u/yuhaoqiu)\
**Replies:** 0\
**Last updated:** [July 9, 2021, 3:14pm UTC](https://discourse.vtk.org/t/question-about-vtkhardwareselector/6161 "2021-07-09T15:14:33Z")

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I noticed that vtkHardwareSelector provided a function for mappers to support hardware selection without having to rebuild any of their VBO/IBOs to maintain fast picking performance. Here is my code,I wish to re-color …

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## [Python - Rendering multiple stacked vtkImageData in 2D](https://discourse.vtk.org/t/python-rendering-multiple-stacked-vtkimagedata-in-2d/6160)

<div class="topic-metadata">

**Author:** [@Birkl](https://discourse.vtk.org/u/Birkl)\
**Replies:** 0\
**Last updated:** [July 9, 2021, 1:45pm UTC](https://discourse.vtk.org/t/python-rendering-multiple-stacked-vtkimagedata-in-2d/6160 "2021-07-09T13:45:10Z")

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Hello, Right to the point: I’ve got several vtkImageData stored in an array. I want to take slice from each image and render them on top of each other. I also need to be able to set different images active and inactiv…

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## [Unsymmetric contour rendered by symmetric data](https://discourse.vtk.org/t/unsymmetric-contour-rendered-by-symmetric-data/5848)

<div class="topic-metadata">

**Author:** [@kamyar](https://discourse.vtk.org/u/kamyar)\
**Replies:** 1\
**Last updated:** [July 8, 2021, 5:13pm UTC](https://discourse.vtk.org/t/unsymmetric-contour-rendered-by-symmetric-data/5848 "2021-07-08T17:13:56Z")

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Hi, The problem of “Unsymmetric contour rendered by symmetric data” explained in Paraview support on the following links: https://discourse.paraview.org/t/unsymmetric-contour-rendered-by-symmetric-data/4118 https://di…

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## [Plane cut through tetrahedron grid preserving only whole original cells](https://discourse.vtk.org/t/plane-cut-through-tetrahedron-grid-preserving-only-whole-original-cells/6154)

<div class="topic-metadata">

**Author:** [@steffen-sch](https://discourse.vtk.org/u/steffen-sch)\
**Replies:** 0\
**Last updated:** [July 8, 2021, 3:58pm UTC](https://discourse.vtk.org/t/plane-cut-through-tetrahedron-grid-preserving-only-whole-original-cells/6154 "2021-07-08T15:58:15Z")

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I want to cut through an unstructured grid of tetrahedrons by a plane. The resulting grid should only contain original cells that are on one side of the plane. It should not contain new dissected cells. How can this be …

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## [Need help displaying processed NumPy array properly.](https://discourse.vtk.org/t/need-help-displaying-processed-numpy-array-properly/3499)

<div class="topic-metadata">

**Author:** [@rishyak](https://discourse.vtk.org/u/rishyak)\
**Replies:** 1\
**Last updated:** [July 8, 2021, 3:35pm UTC](https://discourse.vtk.org/t/need-help-displaying-processed-numpy-array-properly/3499 "2021-07-08T15:35:44Z")

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I have a model that uses NumPy arrays. The inputs and outputs are those arrays. I want to display this on a webpage and I’m struggling with that. I believe the problem I’m facing is that out model uses marching cubes w…

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## [VtkRenderer error](https://discourse.vtk.org/t/vtkrenderer-error/6143)

<div class="topic-metadata">

**Author:** [@Synfony](https://discourse.vtk.org/u/Synfony)\
**Replies:** 4\
**Last updated:** [July 8, 2021, 3:23pm UTC](https://discourse.vtk.org/t/vtkrenderer-error/6143 "2021-07-08T15:23:44Z")

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Hi, I am getting “Re-setting view-up since view plane normal is parallel” runtime error message arising from …\\Rendering\\Core\\vtkRenderer.cxx line 1175 This error message is showing when I move the outline box to view…

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